Barking machines



Feb. 6, 1962 K. o. e. HEROLF BARKING MACHINES 4 Sheets-Sheet 1 Filed Dec. 21, 1959 INVENT OR ATTORNEY 6 Feb. 6, 1962 K; o. G. HEROLF BARKING MACHINES 4 Sheets-Sheet 2 Filed Dec. 21, 1959 L 'r--- T INVENT OR W 010 BY Pm9 PM ATTORNEYS Feb. 6, 1962 K o. s. HEROLF BARKING MACHINES 4 Sheets-Sheet 55 Filed Dec. 21, 1959 INVENTOR Huey Pwm "I/I/ *PWKUC I ATTORNEYS Feb. 6, 1962 K. o. G. HEROLF BARKING. MACHINES 4 Sheets$heet 4 Filed Dec. 21, 1959 INVENTOR q-Pmkm ATTORNEY 5 3,019,825 BARKING MACHINES Kjell ()lof Gunnar'Herolf, Sundsbruk, near Sundsvall, Sweden, assignor to Sunds Verkstader Aktiebolag, Sundsbruk, Sweden Filed Dec. 21, 1959, Ser. No. 861,051 Claims priority, application Sweden Dec. 22, 1953 3 Claims. (Cl. 144-208) The present invention relates to. an improvement in barking machines of the kind which are provided with at lea-st one barking member mounted in a rotary drum or the like and adapted to peform debarking of a log upon the feeding of the log through the drum and in which machines the drum is automatically adjustable in the vertical direction in accordance with the diameters of the logs to be fed into the drum, in order that the undersides of the logsregardless of the diameters of the logsshall always remain on about the same level when the logs are being fed into the drum. According to the invention the drum is journaled in a holder which is provided in the frame of the machine and which is swingable in the vertical direction. The swinging movement of the holder carrying the drum is controllable by means of a log feeding mechanism driven in some suitable manner. The holder for the drum may be mechanically connected with a vertically movable adjusting means which, when a log is being fed into the drum, together with the holder and the drum is movable downwards from its upper, inactive position, to an active lower position corresponding to the thickness of the log, but which, when the log has left the drum, is movable back into its upper position together with the holder and the drum.

Known barking machines of the kind in which there is at least one barking member mounted in a rotary drum or the like, said barking member being adapted to perform debarking upon a log as it passes through the drum, suffer from the drawback of not preventing, in an effective manner, the log from throwing to and fro, unless they are equipped with additional supplyand discharge rolls, guide plates or similar members. If such members are to be provided in the machine the latter will, however, become longer and difiiculties will be encountered in centering the log with respect to the barking member. Said drawbacks are overcome by the present invention.

The invention is illustrated in the accompanying drawings. FIGS. 1-7 show a suitable embodiment of the invention, FIG. 1 showing the machine when viewed from the log supply end, FIG. 2 showing a side elevational View of the machine and FIG. 3 showing a top plan view of the same. FIG. 4 shows the machine, when viewed from the log supply end, when a narrow log is being fed through the machine, and FIG. 5, in the same way, shows the machine when a thick log is being fed therethrough. FIG. 6, on a larger scale, shows a side elevational view of the holder, carrying the drum, and of the feed rolls. FIG. 7 shows a vertical sectional view taken on line 7-7 of FIG. 6. FIG. 8 is a side elevational view corresponding to that of FIG. 6 but showing a somewhat modified log supply mechanism. FIG. 9 shows a vertical sectional view taken on line 9-9 of FIG. 8. FIG. also is a side elevational view corresponding to that of FIG. 6 but showing a somewhat modified embodiment of the log supply and discharge mechanisms. FIG. 11 shows a vertical sectional view taken on line 1111 of FIG. 10. a

The machine consists of a frame 1, in which there is swingably mounted a holder 2, carrying a rotary drum 3 with a number of barking members 4 (FIGS. 3 and 6), mounted therein. In the frame 1 there are, furthermore, swingably mounted two arms 5 and 6, one arm 5 being located in front of the holder 2 carrying the drum 3 and the other arm 6 being located behind said holder (FIG.

members to adjust themselves at various angles.

3,019,825 Patented Feb. 6, 1962 "ice 3). Each of the arms Sand 6 carries a feed roll 7 and 8, respectively. Said rolls are driven in a known manner by suitable means (not shown), see U.S. Patent No. 2,855,010. Each of the arms 5 and 6, by means of a link member 9 and 10, respectively, is coupled with the holder 2. In FIG. 4 there is shown a thin 10g and in FIG. 5 a thick log 11 in the central opening 12 of the holder '2. Below the feed roll 7 there is mounted a double-conical, stationary supporting roll 13. In order that both of the feed rolls 7 and 8 shall contact the log, even if the latter be tapered or crooked, the link members 9 and 14] are provided with integral rubber heads 14, permitting the link The pivot axle of the arms 5 and 6, carrying the feed rolls 7 and 8, is indicated by 15, and the pivot axle of the holder 2, which is positioned on a lower level than the pivot axle 15, is indicated by 16. In order to make it possible for the logs to be inserted between the supply rolls 7 and 13, a hydraulic cylinder '17 or the like is coupled between the arm 5 and the frame of the machine. A similar hydraulie cylinder 17 is coupled between the arm 6 and the frame of the machine. Said cylinders also serve as damping means and arresting members.

In front of the supply rolls 7 and 13 there is provided a supply conveyor 18 (FIG. 2). Below the feed roll 8 there are two double-conical supporting rolls 19 and 20, which are located one after the other in the direction of feed of the log and which are stationary. Behind said supporting rolls there is provided a discharge conveyor 21 The supporting rolls 13, 19 and 20 preferably are embodied as .disk rolls of the appearance as shown for the roll 13 in FIGS. 1, 4, 5 and 7. Between the supporting roll 13 and the holder 2 for the drum there is provided a stationary log guiding means 22, consisting of plates extending into the spaces between the disks of the roll 13 (FIG. 7) Said log guiding means, being located quite close to the holder 2, will prevent the log from throwing, when the log is leaving the supply rolls 7 and 13 during its passage through the machine. The two upper rolls 7 and 8 are provided with spikes 23 or the like, for an effective engagement with the log and preventing the latter from rotating about its own axis. From FIG. 6 it will be seen that the tangent points of the discharge rolls 8, 19 and 20 on the log form a triangle, in which no angle at the base is more than 90, due to which the log will be held fast etfectively.

When a log is to be inserted between the supply rolls 7 and 13 by means of the supply conveyor 18 (FIG. 2),

the feed rolls '7 and 8, which are adapted to be raised and lowered, and thus-due to the link connection 9 and Iiialso the holder 2 with the drum 3 are raised to their uper positions. As soon as the fore end of the log has entered between the rolls 7 and 13, the arms 5 and 6 with the rolls 7 and 8 are swung downwardly until the feed roll 7 hits the log, which is resting on the stationary supporting roll 13. At the same time also the holder 2- with the drum is swung downwardly so much that the drum will become centered in relation to the log. In case of a thin log the parts in question will be caused to assume the positions shown in FIG. 4, and if the inserted log is a thick one, said same parts will be caused to assume the positions shown in FIG. 5. Whatever the thickness of the inserted log, the holder 2 with the drum thus will be caused to assume a position in which the center of the log will always be right in front of, or approximately right in front of, the centre of the drum. When the log has passed through the drum, in which the barking takes place in a known manner by means of the barking members 4 (FIGS. 3 and 6), it will be inserted between the feed roll 8 and the stationary supporting rolls 19 and 20, from where it will then be removed by the discharge conveyor 21 (FIG. 2).

by the hydraulic cylinder described above.

FIGS. 6 and 7 show the partly barked log 11 while being fed through the'machine. The two arms 5 and 6 with the feed rolls 7 and 8 as well as the holder 2 with the drum 3 are swung upwardly to their upper positions under the influence of the hydraulic cylinders 17, when the log has left the drum, butare again swung downwardly, as mentioned above, as soon as another log has entered between to FIGS. 6 and 7 having been replaced by a stationary supporting r011 24 of the same design as the other stationary supporting rolls 13-, 19 and 20. As will be seen from FIG. 8 the tangent points also of the rolls 7, 13 and 24 on the log shall form'a triangle, in which no angle at the base is more than 90", due to which the lOg will be held'fast elfectively also at the place of insertion. (lose to and in front of the feed roll 7 there may, if desired, be provided an additional feed roll 25 which is adapted to be raised and lowered and which is provided with spikes or the like, said roll being coupled with the roll 7 and being intended to enter into function, if said lastrnentioned roll is arranged to open by itself, without being actuated By coupling, in this manner, the roll 7 with an additional feed roll 25, the roll 7 may be made smaller than would otherwise be the case.

FIGS. 10 and 11 show an embodiment dilfering from the modification shown in FIGS. 8 and 9 in that the two supporting rolls 20 and 24- are smaller than the other two supporting rolls 13 and 19. Hereby a compact construction is attained without the reliable functioning thereof being impaired.

With the' above described construction the machine will have a comparatively small number of movable parts,

which, moreover, are easily'accessible. Furthermore, the machine oifers the advantage that the log is caused to move through'the machine on substantially the same level as that assumed by the log on the supply and discharge conveyors.

Having now'described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A barking machine comprising a frame, a substantially horizontally disposed holder swingably mounted adjacent one end thereof about a pivot axis on said frame, the remainder of said holder being adapted to move substantially vertically, a rotary drum journaled in said holder and movable therewith, at least one barking member mounted insaid drum and adapted to engage a log which is passed axially through saidd rum, means for guiding a log longitudinally through said drum, said log-guiding means comprising a lower stationary conveyor, at least one arm swingably mounted adjacent one end thereof about a pivot axis to said frame, the other end of said arm being adapted to move substantially vertically above said stationary conveyor and a roll mounted adjacent said other end of said arm and movable therewith, said roll being adapted to engage a log on said stationary conveyor, and means including a link connecting said arm to said holder to cause vertical movement of said roll, effected by engagement thereof with the upper surface of a log, to automatically move said holder to center said drums with respect to a log as it is passed therethrough.

2. A barking machine as defined in claim 1 in which there are two of said arms swingably mounted on said frame, each carrying a roll adapted to engage a log which is passed through said drum, one of said arms being in front of said drum and the other behind said drum with respect to the direction of movement of a'log through said drum, and a link connecting each of said arms to said holder, each link comprising an elastic portion permitting a limited relative movement of the arms and rolls with respect to said holder and drum.

3. A barking machine as defined in claim 1 in which the pivot axis of said holder to said frame is at'a lower lever than the pivot axis of said arm to saidframe.

References Cited in the file ofthis patent UNITED STATES PATENTS 2,591,751 Whitlock .Apr. 8, 1952 2,749,952 League June 12, 1956 2,908,302 Mullis Oct. 13, 1959 2,925,107 Fitzwater Feb. 16, 1960 FOREIGN PATENTS 39,704 Sweden -'Dec. 1, 1915 517,111 Germany Jan. 31, 1931 

